|Author||Prasad, C. D. ♦ Chandrasekhar, T. ♦ Desai, J. N. ♦ Ashok, N. M. ♦ Sivaraman, K. R. ♦ Rajmohan, R.|
|Source||Indian Institute of Astrophysics|
|Subject Domain (in DDC)||Natural sciences & mathematics ♦ Physics|
|Subject Keyword||Amines ♦ Emission Spectra ♦ Halley's Comet ♦ Line Shape ♦ Oxygen Spectra ♦ Astronomical Spectroscopy ♦ H Alpha Line|
|Description||The forbidden O I line and NH2 (0-8-0) emissions of Comet Halley at about 6300 A were observed during April 1986 using a Fabry-Perot spectrometer with a resolution of about 0.14 A. The forbidden O I line and NH2 rotational lines were spectrally well separated by the interferometer and a NH2/O I ratio of about 0.5 was found. The profile analysis shows the profiles of forbidden O I line and NH2 to be symmetric with linewidths of about 3.5-3 km/s. The cometary Balmer emission of hydrogen at 6563 A was barely detectable. An upper limit for H(alpha) based on the instrumental sensitivity yields a value of 30 Rayleighs.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
|Publisher Institution||Astronomical Society of the Pacific|
Ministry of Human Resource Development (MHRD) under its National Mission on Education through Information and Communication Technology (NMEICT) has initiated the National Digital Library of India (NDL India) pilot project to develop a framework of virtual repository of learning resources with a single-window search facility. Filtered and federated searching is employed to facilitate focused searching so that learners can find out the right resource with least effort and in minimum time. NDL India is designed to hold content of any language and provides interface support for leading Indian languages. It is being arranged to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular form of access devices and differently-abled learners. It is being developed to help students to prepare for entrance and competitive examination, to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. The pilot project is devising a framework that is being scaled up with respect to content volume and diversity to serve all levels and disciplines of learners. It is being developed at Indian Institute of Technology Kharagpur.
NDL India is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with respective organization from where the contents are sourced and NDL India has no responsibility or liability for these. Every effort is made to keep the NDL India portal up and running smoothly. However, NDL India takes no responsibility for, and will not be liable for, the portal being unavailable due to technical issues or otherwise.
Ministry of Human Resource Development (MHRD), through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDL India) pilot project.
For any issue or feedback, please write to email@example.com
COVID-19 Lockdown not to affect your study. Study through National Digital Library of India (NDLI).